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<h2><span class="refentrytitle"><a name="gio-Watching-Bus-Names.top_of_page"></a>Watching Bus Names</span></h2>
<p>Watching Bus Names — Simple API for watching bus names</p>
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<div class="refsynopsisdiv">
<a name="gio-Watching-Bus-Names.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;gio/gio.h&gt;

<span class="returnvalue">void</span>                (<a class="link" href="gio-Watching-Bus-Names.html#GBusNameAppearedCallback" title="GBusNameAppearedCallback ()">*GBusNameAppearedCallback</a>)         (<em class="parameter"><code><a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name_owner</code></em>,
                                                         <em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<span class="returnvalue">void</span>                (<a class="link" href="gio-Watching-Bus-Names.html#GBusNameVanishedCallback" title="GBusNameVanishedCallback ()">*GBusNameVanishedCallback</a>)         (<em class="parameter"><code><a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
enum                <a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags">GBusNameWatcherFlags</a>;
<a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()">g_bus_watch_name</a>                    (<em class="parameter"><code><a class="link" href="gio-GDBusConnection.html#GBusType" title="enum GBusType"><span class="type">GBusType</span></a> bus_type</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameAppearedCallback" title="GBusNameAppearedCallback ()"><span class="type">GBusNameAppearedCallback</span></a> name_appeared_handler</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameVanishedCallback" title="GBusNameVanishedCallback ()"><span class="type">GBusNameVanishedCallback</span></a> name_vanished_handler</code></em>,
                                                         <em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="../glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> user_data_free_func</code></em>);
<a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name-on-connection" title="g_bus_watch_name_on_connection ()">g_bus_watch_name_on_connection</a>      (<em class="parameter"><code><a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameAppearedCallback" title="GBusNameAppearedCallback ()"><span class="type">GBusNameAppearedCallback</span></a> name_appeared_handler</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameVanishedCallback" title="GBusNameVanishedCallback ()"><span class="type">GBusNameVanishedCallback</span></a> name_vanished_handler</code></em>,
                                                         <em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="../glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> user_data_free_func</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gio-Watching-Bus-Names.html#g-bus-unwatch-name" title="g_bus_unwatch_name ()">g_bus_unwatch_name</a>                  (<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> watcher_id</code></em>);
<a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name-with-closures" title="g_bus_watch_name_with_closures ()">g_bus_watch_name_with_closures</a>      (<em class="parameter"><code><a class="link" href="gio-GDBusConnection.html#GBusType" title="enum GBusType"><span class="type">GBusType</span></a> bus_type</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a href="../gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_appeared_closure</code></em>,
                                                         <em class="parameter"><code><a href="../gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_vanished_closure</code></em>);
<a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name-on-connection-with-closures" title="g_bus_watch_name_on_connection_with_closures ()">g_bus_watch_name_on_connection_with_closures</a>
                                                        (<em class="parameter"><code><a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a href="../gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_appeared_closure</code></em>,
                                                         <em class="parameter"><code><a href="../gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_vanished_closure</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gio-Watching-Bus-Names.description"></a><h2>Description</h2>
<p>
Convenience API for watching bus names.
</p>
<p>
</p>
<div class="example">
<a name="gdbus-watching-names"></a><p class="title"><b>Example 9. Simple application watching a name</b></p>
<div class="example-contents"><pre class="programlisting">#include &lt;gio/gio.h&gt;

static gchar *opt_name         = NULL;
static gboolean opt_system_bus = FALSE;
static gboolean opt_auto_start = FALSE;

static GOptionEntry opt_entries[] =
{
  { "name", 'n', 0, G_OPTION_ARG_STRING, &amp;opt_name, "Name to watch", NULL },
  { "system-bus", 's', 0, G_OPTION_ARG_NONE, &amp;opt_system_bus, "Use the system-bus instead of the session-bus", NULL },
  { "auto-start", 'a', 0, G_OPTION_ARG_NONE, &amp;opt_auto_start, "Instruct the bus to launch an owner for the name", NULL},
  { NULL}
};

static void
on_name_appeared (GDBusConnection *connection,
                  const gchar     *name,
                  const gchar     *name_owner,
                  gpointer         user_data)
{
  g_print ("Name %s on %s is owned by %s\n",
           name,
           opt_system_bus ? "the system bus" : "the session bus",
           name_owner);
}

static void
on_name_vanished (GDBusConnection *connection,
                  const gchar     *name,
                  gpointer         user_data)
{
  g_print ("Name %s does not exist on %s\n",
           name,
           opt_system_bus ? "the system bus" : "the session bus");
}

int
main (int argc, char *argv[])
{
  guint watcher_id;
  GMainLoop *loop;
  GOptionContext *opt_context;
  GError *error;
  GBusNameWatcherFlags flags;

  g_type_init ();

  error = NULL;
  opt_context = g_option_context_new ("g_bus_watch_name() example");
  g_option_context_set_summary (opt_context,
                                "Example: to watch the power manager on the session bus, use:\n"
                                "\n"
                                "  ./example-watch-name -n org.gnome.PowerManager");
  g_option_context_add_main_entries (opt_context, opt_entries, NULL);
  if (!g_option_context_parse (opt_context, &amp;argc, &amp;argv, &amp;error))
    {
      g_printerr ("Error parsing options: %s", error-&gt;message);
      goto out;
    }
  if (opt_name == NULL)
    {
      g_printerr ("Incorrect usage, try --help.\n");
      goto out;
    }

  flags = G_BUS_NAME_WATCHER_FLAGS_NONE;
  if (opt_auto_start)
    flags |= G_BUS_NAME_WATCHER_FLAGS_AUTO_START;

  watcher_id = g_bus_watch_name (opt_system_bus ? G_BUS_TYPE_SYSTEM : G_BUS_TYPE_SESSION,
                                 opt_name,
                                 flags,
                                 on_name_appeared,
                                 on_name_vanished,
                                 NULL,
                                 NULL);

  loop = g_main_loop_new (NULL, FALSE);
  g_main_loop_run (loop);

  g_bus_unwatch_name (watcher_id);

 out:
  g_option_context_free (opt_context);
  g_free (opt_name);

  return 0;
}
</pre></div>
</div>
<p><br class="example-break">
</p>
</div>
<div class="refsect1">
<a name="gio-Watching-Bus-Names.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GBusNameAppearedCallback"></a><h3>GBusNameAppearedCallback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                (*GBusNameAppearedCallback)         (<em class="parameter"><code><a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name_owner</code></em>,
                                                         <em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Invoked when the name being watched is known to have to have a owner.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>connection</code></em> :</span></p></td>
<td>The <a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a> the name is being watched on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name being watched.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_owner</code></em> :</span></p></td>
<td>Unique name of the owner of the name being watched.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>User data passed to <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="GBusNameVanishedCallback"></a><h3>GBusNameVanishedCallback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                (*GBusNameVanishedCallback)         (<em class="parameter"><code><a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Invoked when the name being watched is known not to have to have a owner.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>connection</code></em> :</span></p></td>
<td>The <a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a> the name is being watched on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name being watched.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>User data passed to <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="GBusNameWatcherFlags"></a><h3>enum GBusNameWatcherFlags</h3>
<pre class="programlisting">typedef enum
{
  G_BUS_NAME_WATCHER_FLAGS_NONE = 0,
  G_BUS_NAME_WATCHER_FLAGS_AUTO_START = (1&lt;&lt;0)
} GBusNameWatcherFlags;
</pre>
<p>
Flags used in <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="G-BUS-NAME-WATCHER-FLAGS-NONE:CAPS"></a><span class="term"><code class="literal">G_BUS_NAME_WATCHER_FLAGS_NONE</code></span></p></td>
<td>No flags set.
</td>
</tr>
<tr>
<td><p><a name="G-BUS-NAME-WATCHER-FLAGS-AUTO-START:CAPS"></a><span class="term"><code class="literal">G_BUS_NAME_WATCHER_FLAGS_AUTO_START</code></span></p></td>
<td>If no-one owns the name when
beginning to watch the name, ask the bus to launch an owner for the
name.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="g-bus-watch-name"></a><h3>g_bus_watch_name ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               g_bus_watch_name                    (<em class="parameter"><code><a class="link" href="gio-GDBusConnection.html#GBusType" title="enum GBusType"><span class="type">GBusType</span></a> bus_type</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameAppearedCallback" title="GBusNameAppearedCallback ()"><span class="type">GBusNameAppearedCallback</span></a> name_appeared_handler</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameVanishedCallback" title="GBusNameVanishedCallback ()"><span class="type">GBusNameVanishedCallback</span></a> name_vanished_handler</code></em>,
                                                         <em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="../glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> user_data_free_func</code></em>);</pre>
<p>
Starts watching <em class="parameter"><code>name</code></em> on the bus specified by <em class="parameter"><code>bus_type</code></em> and calls
<em class="parameter"><code>name_appeared_handler</code></em> and <em class="parameter"><code>name_vanished_handler</code></em> when the name is
known to have a owner respectively known to lose its
owner. Callbacks will be invoked in the <GTKDOCLINK HREF="g-main-context-push-thread-default">thread-default main
loop</GTKDOCLINK> of the thread you are calling this function from.
</p>
<p>
You are guaranteed that one of the handlers will be invoked after
calling this function. When you are done watching the name, just
call <a class="link" href="gio-Watching-Bus-Names.html#g-bus-unwatch-name" title="g_bus_unwatch_name ()"><code class="function">g_bus_unwatch_name()</code></a> with the watcher id this function
returns.
</p>
<p>
If the name vanishes or appears (for example the application owning
the name could restart), the handlers are also invoked. If the
<a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a> that is used for watching the name disconnects, then
<em class="parameter"><code>name_vanished_handler</code></em> is invoked since it is no longer
possible to access the name.
</p>
<p>
Another guarantee is that invocations of <em class="parameter"><code>name_appeared_handler</code></em>
and <em class="parameter"><code>name_vanished_handler</code></em> are guaranteed to alternate; that
is, if <em class="parameter"><code>name_appeared_handler</code></em> is invoked then you are
guaranteed that the next time one of the handlers is invoked, it
will be <em class="parameter"><code>name_vanished_handler</code></em>. The reverse is also true.
</p>
<p>
This behavior makes it very simple to write applications that wants
to take action when a certain name exists, see <a class="xref" href="gio-Watching-Bus-Names.html#gdbus-watching-names" title="Example 9. Simple application watching a name">Example 9, “Simple application watching a name”</a>. Basically, the application
should create object proxies in <em class="parameter"><code>name_appeared_handler</code></em> and destroy
them again (if any) in <em class="parameter"><code>name_vanished_handler</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bus_type</code></em> :</span></p></td>
<td>The type of bus to watch a name on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name (well-known or unique) to watch.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>Flags from the <a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> enumeration.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_appeared_handler</code></em> :</span></p></td>
<td>Handler to invoke when <em class="parameter"><code>name</code></em> is known to exist or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_vanished_handler</code></em> :</span></p></td>
<td>Handler to invoke when <em class="parameter"><code>name</code></em> is known to not exist or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>User data to pass to handlers.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data_free_func</code></em> :</span></p></td>
<td>Function for freeing <em class="parameter"><code>user_data</code></em> or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>An identifier (never 0) that an be used with
<a class="link" href="gio-Watching-Bus-Names.html#g-bus-unwatch-name" title="g_bus_unwatch_name ()"><code class="function">g_bus_unwatch_name()</code></a> to stop watching the name.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="g-bus-watch-name-on-connection"></a><h3>g_bus_watch_name_on_connection ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               g_bus_watch_name_on_connection      (<em class="parameter"><code><a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameAppearedCallback" title="GBusNameAppearedCallback ()"><span class="type">GBusNameAppearedCallback</span></a> name_appeared_handler</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameVanishedCallback" title="GBusNameVanishedCallback ()"><span class="type">GBusNameVanishedCallback</span></a> name_vanished_handler</code></em>,
                                                         <em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="../glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> user_data_free_func</code></em>);</pre>
<p>
Like <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a> but takes a <a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a> instead of a
<a class="link" href="gio-GDBusConnection.html#GBusType" title="enum GBusType"><span class="type">GBusType</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>connection</code></em> :</span></p></td>
<td>A <a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name (well-known or unique) to watch.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>Flags from the <a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> enumeration.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_appeared_handler</code></em> :</span></p></td>
<td>Handler to invoke when <em class="parameter"><code>name</code></em> is known to exist or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_vanished_handler</code></em> :</span></p></td>
<td>Handler to invoke when <em class="parameter"><code>name</code></em> is known to not exist or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>User data to pass to handlers.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data_free_func</code></em> :</span></p></td>
<td>Function for freeing <em class="parameter"><code>user_data</code></em> or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>An identifier (never 0) that an be used with
<a class="link" href="gio-Watching-Bus-Names.html#g-bus-unwatch-name" title="g_bus_unwatch_name ()"><code class="function">g_bus_unwatch_name()</code></a> to stop watching the name.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="g-bus-unwatch-name"></a><h3>g_bus_unwatch_name ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                g_bus_unwatch_name                  (<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> watcher_id</code></em>);</pre>
<p>
Stops watching a name.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>watcher_id</code></em> :</span></p></td>
<td>An identifier obtained from <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="g-bus-watch-name-with-closures"></a><h3>g_bus_watch_name_with_closures ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               g_bus_watch_name_with_closures      (<em class="parameter"><code><a class="link" href="gio-GDBusConnection.html#GBusType" title="enum GBusType"><span class="type">GBusType</span></a> bus_type</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a href="../gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_appeared_closure</code></em>,
                                                         <em class="parameter"><code><a href="../gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_vanished_closure</code></em>);</pre>
<p>
Version of <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a> using closures instead of callbacks for
easier binding in other languages.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bus_type</code></em> :</span></p></td>
<td>The type of bus to watch a name on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name (well-known or unique) to watch.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>Flags from the <a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> enumeration.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_appeared_closure</code></em> :</span></p></td>
<td>
<a href="../gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> to invoke when <em class="parameter"><code>name</code></em> is known
to exist or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_vanished_closure</code></em> :</span></p></td>
<td>
<a href="../gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> to invoke when <em class="parameter"><code>name</code></em> is known
to not exist or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>An identifier (never 0) that an be used with
<a class="link" href="gio-Watching-Bus-Names.html#g-bus-unwatch-name" title="g_bus_unwatch_name ()"><code class="function">g_bus_unwatch_name()</code></a> to stop watching the name.
Rename to: g_bus_watch_name</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="g-bus-watch-name-on-connection-with-closures"></a><h3>g_bus_watch_name_on_connection_with_closures ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               g_bus_watch_name_on_connection_with_closures
                                                        (<em class="parameter"><code><a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a href="../gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_appeared_closure</code></em>,
                                                         <em class="parameter"><code><a href="../gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_vanished_closure</code></em>);</pre>
<p>
Version of <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name-on-connection" title="g_bus_watch_name_on_connection ()"><code class="function">g_bus_watch_name_on_connection()</code></a> using closures instead of callbacks for
easier binding in other languages.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>connection</code></em> :</span></p></td>
<td>A <a class="link" href="gio-GDBusConnection.html#GDBusConnection" title="GDBusConnection"><span class="type">GDBusConnection</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name (well-known or unique) to watch.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>Flags from the <a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> enumeration.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_appeared_closure</code></em> :</span></p></td>
<td>
<a href="../gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> to invoke when <em class="parameter"><code>name</code></em> is known
to exist or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_vanished_closure</code></em> :</span></p></td>
<td>
<a href="../gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> to invoke when <em class="parameter"><code>name</code></em> is known
to not exist or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>An identifier (never 0) that an be used with
<a class="link" href="gio-Watching-Bus-Names.html#g-bus-unwatch-name" title="g_bus_unwatch_name ()"><code class="function">g_bus_unwatch_name()</code></a> to stop watching the name.
Rename to: g_bus_watch_name_on_connection</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
</div>
</div>
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